In ancient times, dogs were mainly ______helping people hunt( 打猎) .Now they are more useful-they can help the blinds, search for the bad eggs.
—You __________ in the south of China, didn’t you? —Yes, but now I like living here though it’s cold all the year around.
—I can’t always understand when people talk to me in English. —Why not __________English more after class?
— You must keep the door _______ when you leave your room. — But I want to get the fresh air. I think I can keep the window ________ instead.
—Look at the girl! Is it Susan? —No, it __________ be her. She has gone back to her hometown.
—What a nice watch! —My grandpa gave it to me as a gift on my __________ birthday.